Adding a new problem
Added new tests to check and deal with mailSender problems.
Added a new problem to be solved.
Changed the exception type to check any catching error
Changed the exception type to check any catching error
Added a new problem, and test to be solved.
Solved a new problem, also added tests that verify that an auction with two update problems, doesnt send messages.
Merge pull request #5 from helmedeiros/MockThatThrowExceptions

Mock that throw exceptions